Do we absolutely need to engineer this thing ourselves? There's a wealth of after-market GPU coolers, some of which are quite affordable, and It'd be a nice advantage to have a semi-standard mounting system (does such a thing exist for GPUs?) to facilitate the interchange of heatsinks (for instance to allow someone to purchase an extra-large passive cooler, or an all-out water-cooled heatpipe unit... different people have different needs ;)
Here are some examples that touch on some of the spectrum: http://plycon.com/chipset/chipset.htm Just a thought. --tim On 9/9/05, Timothy Miller <[EMAIL PROTECTED]> wrote: > On 9/9/05, Jack Carroll <[EMAIL PROTECTED]> wrote: > > > > > Dunno what to tell you. We could probably figure out something, and > > bench-test it to prove that it cools the chips. If we were to put a > > centrifugal blower outside the cramped area, and use flat ductwork to carry > > the air to the heat sink, it would probably have to be some kind of > > cut-to-fit ductwork that could be easily configured in the field to fit > > where it has to go. Another possibility might be a heat sink with cooling > > pins instead of fins, and increase its area to get the volume up even with > > limited thickness. That might work with natural convection flow in any > > direction, if the total heat load isn't too large. There still has to be a > > way for air to get in and out of the area, though, or nothing will work. > > I've done some of this kind of design, but only in well-understood > > industrial situations. I'm no expert on forced-air cooling, and I don't > > know the component suppliers for blowers that can run from motherboard fan > > headers. Maybe Aavid or Wakefield Engineering has some application notes or > > tutorials that could educate us. I can at least look. > > If this threatens to become a big deal, we might want to mount an > > analog temperature IC on the heat sink, so the developer can tell what's > > really happening. There are some that can be read out with a common > > hand-held voltmeter. I could look in a couple of catalogs if you want me > > to. > > I'm so thankful I picked the builder of my big dual Athlon machine > > for their expertise in airflow. > > I guess the thing that has to be done fairly soon, before parts > > placement can get under way, is decide the space envelope allocated to the > > on-board heat sink, and the method of attachment and conductive heat > > transfer. Screw holes may have to be placed in the board for heat sink > > mounting, and their sizes, locations, and keep-out zones must be included in > > the dimension drawing at start of design. Don't forget to analyze the > > tolerance stack-ups around the holes, and make the keep-out zones large > > enough to contain screw heads, lock washers, and spacers at maximum > > misalignment plus .015" clearance to the nearest live copper. I always > > connect mounting hole pads to the ground plane. > > I'll talk to Howard further on this. Tech Source has used some > centrifugal fans on their longer medical cards, but for OGD, we would > like to have a shorter card, if possible. > > Let's focus on passive cooling for the moment. > > _______________________________________________ > Open-graphics mailing list > [email protected] > http://lists.duskglow.com/mailman/listinfo/open-graphics > List service provided by Duskglow Consulting, LLC (www.duskglow.com) > _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
